Accrued Product Warranty (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 27, 2013	Dec. 28, 2012
Warranty Liability [Line Items]
Accrued product warranty, at beginning of period	$ 53.2	$ 52.8
Charged to cost of revenues	15.2	11.8
Actual product warranty expenditures	(17.7)	(13.9)
Accrued product warranty, at end of period	$ 50.7	$ 50.7